What would you do?
We have a mostly above-ground basement, dirt is on the front side, the back is fully above grade, and the two sides slope down. The basement is fully finished, minus two utility rooms, one being in a below-grade corner (electrical and ejector pump pit), and the other being above grade (water tank and well pressure tank). We had a lab test done, placed in a closet space that is against the below-grade side of the house, and measured 3.6 pi/L. We got a monitor and is also averaging 2.9-3.8, depending on where we place it in the bottom level. We have a living space, a guest bedroom, a gym, and an office. The office is now going to be used 8-4 M-F. Is this too close for comfort? What kind of options for mitigation are there (Eastern US?), and what are we looking like cost-wise?